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A general method to coat colloidal particles with titania.

Ahmet Faik Demirörs¹, Alfons van Blaaderen, Arnout Imhof

¹Soft Condensed Matter, Debye Institute for Nanomaterials Science, Department of Physics and Astronomy, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands. a.f.demirors@uu.nl

Langmuir : the ACS Journal of Surfaces and Colloids

|March 26, 2010

Summary

This summary is machine-generated.

A new one-pot method efficiently coats diverse colloidal particles with titania shells. This versatile technique offers tunable thickness and potential applications in photonic crystals and hollow shell fabrication.

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Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Existing titania coating methods are material-specific.
A universal approach for titania shell coating is lacking.
Precoating steps or coupling agents are often required.

Purpose of the Study:

To develop a general one-pot method for coating various colloidal particles with amorphous titania.
To enable tunable titania shell thickness.
To explore fabrication of hollow titania shells.

Main Methods:

A one-pot synthesis procedure for amorphous titania shell formation.
Application of the method to silica, silver, gibbsite, and polystyrene particles.
Calcination step to convert amorphous to crystalline titania.

Main Results:

Successful coating of diverse colloidal particles with titania.
Achieved tunable titania layer thickness and improved monodispersity.
Demonstrated fabrication of hollow titania shells.
Identified titania growth as a surface-reaction-limited process.

Conclusions:

The developed method provides a versatile and efficient way to coat various colloidal particles with titania.
The resulting titania-coated particles are suitable for photonic crystal applications.
Hollow titania shells can be fabricated for diverse applications in electronics, catalysis, and diagnostics.